Improvement in smelting fubnaoes



4 PAT'ENTBD MAY 14, "1867,

' J. A; ROOT M. N. BARTRAM. v

SMELTING FURNACE.

.ro ALL WHOM IT MAY announce.

game .tetza gatcut' ffice.

JAMES ROOT, OF EAST GANAAN, AND J. N. BARTRAM, OF SHARON,

OONNEGTIOUT.

Leila Patent No. 64,709, and May 1l, 1867.

the gamma name is in these Eaters new mu inking and of it: emu.

Bait kno'wn that we, Jlmss A. Beer, of East Canaan, Litehfield county, Connecticut, and J. N.'BAnrn.-m,

,of Sharon, Litchfield county, Connecticut, have invented a new and improved smelting Furnace; andv that the following description taken ,in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein wehave set forth the nature and principles of our said improvements, by which our invention may be distinguished from all otherslof a similar class, together with such parts as we claim and desire to have secured to usby Letters Patent.

This invention consists in constructing the hearth of stone cut and laidin -such a manner as to have a circular interior in its horizontal section, and admit of the furnace operating perfectly when first erected. The usual way is to build the lrearths of fire-stone, and of square form, which invariably operate imperfectly until the attrition caused by the descending ore wears tlicm. into cylindrical form. The angular cornersform a great obstruction to the descending ore, and occasion considerable trouble until they become rounded by wear. The invention further consists-in a gnovel and improved manner of constructing the blast tubes, ,to wit, with 'tele-' scopic slides or extension pipes as hereinafter fully shown and described, whereby said pipes may with the greatest facility he graduated in length as circumstances require. In the accompanying sheet of d'rawin-gs- Figure 1, Sheet No. 1, is awertical section of. our invention. taken in the line a: z, fig. 2. Figure 2, Sheet No. 2, aherizonta-l section of the same taken in the line y 3 fig. 1.

.Figure 3, a detached outer' sidc view of the blast pipes. "Similar letters of referrals-e indicate like parts. 7 v A represents the hearth (if-the furnace, which is constructed of cut stone, the inuernsidcs of which are .curved, forming segments of circles, so that when the stonesare laid up the hearth will have an interior of inverted conical form, a's shown in fig. 1, a stone, a, extending entirely over the passage 6, through which the metal is drawn. The stone of p which the hearth is built or composed should be of. that kind which will resist the action of heat. We have used a species found in our locality, (Litehfield county, Conneeticut,) which has proved .to be exceedingly durable. B B represent the pipes, which conduct the blast to the interior of: the hearth."

Any su-itablenumber of these pipes may be used. They are arranged in pairs, each pair communicating with a main one, as shown in red, (see figs. 1 and Each pipe B is'of L form, the upper parts being composed of sections secured together by belts or otherwise, and the lower parts are composed of a series of sections, o

arranged that they may slide one within the other, (see fig. 1,) and be capable of -being extended or shortened as occasion may require. The ends of these lower partsof the blast tubes are fitted in tuyere's, shown in red in fig. 1, and it will be seen that by this telescopic arrangement of the sections 0, the blast tubes may be adjusted to compensate for the diminution of .the thickness of the hearth, occasioned by the action of heat, and also to s accommodate'the exact position of the main blast tubes or pipes. Each pipe Bis provided'with a. valve, G,'for regulating thestrength of the blast, and at the outer endof the lower part of each tubeB there is an opening,

(1, covered'by'a slide or pivoted lid,'e: Just above this thereisinserted a glass, f, through which the operatives may look'to see. whether the pipes are. becoming choked'or' clogged, in which case rods are inserted through the openings d for the purpose of cleaning them. The lower part of the pipes B B may be of sheet metal and the upper parts of cast metal. We do not, however, confine ourselves to any particular'material; 7

Having thus described our-invcntion,we'elaim as-'-new ,-and desire to secure by Letters Paten t-' r v 1. The constructing of the hearth of a smelting furnace of cut stone having their inner surfaces rounded so as to form an interior of invcrtedconical shape, with a solid or single stone, a,"extending across the passage 6, substantihlly in the manner as and for. the purpose set forth. v

2. Having the lower parts of the blast pipes B-formed of sections 0, arranged to slide one within the other,

substantially as and for the purpose specified. b r j 3. The glasses f in the pipes B; in combination with the openings d, substantially as and for the purpose set'fmh' :1 JAMES A. R001, I 1 J N. BARTRAM.

Witnesses: I

,Fannsmex WATSON, j

. MILES T. Gunmen. 

